Is the oem dot 4 sufficient for the track?

flsupraguy · 11-01-2022, 06:07 AM

Is the oem brake fluid good or should I flush it and do something else?

jmg · 11-01-2022, 12:37 PM

Flush and use Castrol SRF or Motul 660.

flsupraguy · 11-01-2022, 01:14 PM

Quote:

Originally Posted by jmg

Flush and use Castrol SRF or Motul 660.

Thank you. Which do you use?

jmg · 11-01-2022, 01:20 PM

Quote:

Originally Posted by flsupraguy

Thank you. Which do you use?

I've used both without boiling the fluid. Motul 660 has a higher dry boiling point, but Castrol SRT has a higher wet boiling point. Basically, the SRF will be more effective than the Motul 660 as they absorb more water and age. Motul 660 is cheaper right now at about half the price, so if you flush more often, the 660 might be the way to go.

moproblems · 11-02-2022, 02:09 PM

I personally found great effect with endless rf650. Never had it go soft and it modulates well.

BMWRacer523 · 11-11-2022, 08:44 PM

It depends on many factors such how often you flush the fluid and what sort of tracks you run as well as how many laps you run each event. I'm still running oem fluid and have had no issues after 5 track events but I did flush it once in between those events. You should flush brake fluid at least every 6 months regardless for track applications.

I've used Motul before on dedicated track/race cars with good results. Keep in mind that you cannot pressure bleed these cars (brake by wire), they need to be bled by actuating the calipers via ISTA so I paid the dealer to flush OEM fluid to keep things simple.

froz3ng80 · 11-24-2022, 03:18 PM

I'm also thinking of doing track day soon. Just purchased some castrol srf. Is there anything else I should check/change for track.
Tires are brand new, and car was just serviced less than 100miles ago.

Boomer 2019 · 11-25-2022, 11:14 AM

Without knowing the track; how much time you will be spending on the track; or your driving experience, I would suggest that you monitor the rear brake pads closely throughout the day. The fronts will be fine. If you are easy on the braking you should be fine for the day. If you achieve high speeds, brake aggressively, and spend a couple of hours or more "on track" they will work well, but wear down very rapidly. They are street pads, not track pads. It is possible to to take them down from the full 12mm to 0mm in the course of a single day if driven hard. Watch them.. don't be that guy.

11-01-2022, 06:07 AM	#1
flsupraguy First Lieutenant 401 Rep 382 Posts Drives: M5 Join Date: Mar 2018 Location: FL iTrader: (0)	Is the oem dot 4 sufficient for the track? Is the oem brake fluid good or should I flush it and do something else?
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11-01-2022, 12:37 PM	#2
jmg Lieutenant General 18749 Rep 14,121 Posts Drives: G82 M4C X-Drive Join Date: Mar 2013 Location: Orange County, CA iTrader: (1) Garage List 2022 G82 M4C X-Drive [9.85] 2018 F80 M3 CS [9.87] 2019 i3 BEV [0.00]	Flush and use Castrol SRF or Motul 660. __________________ 2022 G82///M4 Competition X-Drive - KW-HAS, EBC Bluestuff, Millway Race Camber Plates, Cup2 Connect, PSI High Flow Midpipe, Lightweight Front Lip, M Perf Flow Through Wing Previous • 2018 F80 ///M3 CS • 2016 F80 ///*M3 IG: Raging_G82
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11-02-2022, 02:09 PM	#5
moproblems Beware of cheap bait! 711 Rep 715 Posts Drives: 2021 M4 Isle of Man Green Join Date: Apr 2021 Location: SW MI iTrader: (0)	I personally found great effect with endless rf650. Never had it go soft and it modulates well.
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11-11-2022, 08:44 PM	#6
BMWRacer523 Lieutenant Colonel 2519 Rep 1,773 Posts Drives: G80 M3 Competition xDrive Join Date: Aug 2021 Location: NJ iTrader: (0)	It depends on many factors such how often you flush the fluid and what sort of tracks you run as well as how many laps you run each event. I'm still running oem fluid and have had no issues after 5 track events but I did flush it once in between those events. You should flush brake fluid at least every 6 months regardless for track applications. I've used Motul before on dedicated track/race cars with good results. Keep in mind that you cannot pressure bleed these cars (brake by wire), they need to be bled by actuating the calipers via ISTA so I paid the dealer to flush OEM fluid to keep things simple.
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11-24-2022, 03:18 PM	#7
froz3ng80 Private First Class 297 Rep 125 Posts Drives: 2022 G80 M3 Comp xDrive Join Date: Oct 2017 Location: California iTrader: (0) Garage List 2022 BMW G80 M3 xDr ... [8.75]	I'm also thinking of doing track day soon. Just purchased some castrol srf. Is there anything else I should check/change for track. Tires are brand new, and car was just serviced less than 100miles ago. __________________ Instagram: @froz3ng80 2018 M4 Competition (sold) 2020 M4 CS (sold) 2022 M3 Competition X Drive (current)
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11-25-2022, 11:14 AM	#8
Boomer 2019 Track Rat 1760 Rep 403 Posts Drives: 2023 M4 Comp Join Date: Nov 2018 Location: Miami, FL iTrader: (0)	Without knowing the track; how much time you will be spending on the track; or your driving experience, I would suggest that you monitor the rear brake pads closely throughout the day. The fronts will be fine. If you are easy on the braking you should be fine for the day. If you achieve high speeds, brake aggressively, and spend a couple of hours or more "on track" they will work well, but wear down very rapidly. They are street pads, not track pads. It is possible to to take them down from the full 12mm to 0mm in the course of a single day if driven hard. Watch them.. don't be that guy. __________________ IOMG // Full Tartufo Leather // MP HAS // Vorshlag Camber Plates // SS Brake Lines Last edited by Boomer 2019; 11-25-2022 at 11:31 AM..
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